Improvement in pole-crabs for vehicles



R. S. GRUMMON.

Pole-Grabs for Vehicles. No. 199,152. Patented Jan. :5, 187's.

PETERS. PHOTD-UTHOGRAFHER. WASHINGTON. D Q

UNITED STATES PATENT QFFICE.

ROBERT S. GRUMMON, OF NEWARK, NEW JERSEY.

IMPROVEMENT lN POLE-CRABS FOR VEHICLES.

Specification forming part of Letters Patent No. 199,152, dated January15, 1878; application filed June 2, 1877.

To all whom it may concern:

Be it known that I, ROBERT S. GRUMIMON, of Newark, in the county ofEssex and State of New Jersey, have invented a new and usefulImprovement in Pole-0rabs for Vehicles, of which the following is aspecification, reference being had to the accompanying drawings.

The invention relates to certain improvements in pole-crabs which areused upon the tongues and poles of vehicles; and consistsin the mattershereinafter fully described.

The object of the invention is to afford a pole-crab having all thestrength of the best forms now in use, and which will be more easyoftransportation and much more cheaply produced.

Figure 1 is a perspective view of a device embodying the elements of theinvention. Fig. 2 is a vertical central longitudinal section of same.

In the accompanying drawings, A represents the pole-tip, which isprovided at one end with a socket togeceive the front extremity of thepole, wherein it is or may be secured in any suitable manner. The otherend of the pole-tip is reduced to a less diameter, forming the annularrecess a.

B represents a bar or yoke, the ends of which are provided withapertures, through which are passed the straps serving to con nect thisyoke with the collars on the horses. At or near the center of the yoke Bis pro vided the socket collar or aperture 11, of such dimensions as toreceive that part of the poletip about the recess a.

The crab is formed by inserting the end of the pole-tip into the socketb, and there securing it rigidly by brazing, shrinking, riveting, or inany other suitable manner.

The pole-crabs now in use are generally made of one piece, of the samematerial, and

are usually composed of wrought or cast iron. These are not desirable orpracticable, for the reason that the cast-iron crab cannot be dependedupon for strength, and the wroughtiron crabs are apt to part, and arevery expensive and difficult of construction.

The novelty and utility of this invention consists in constructing thecrab of two or more pieces of the same or difl'erent material. Thus, inthe present instance, the pole-tip or part A is made of one material,preferably of some cast metal, and the yoke B of another, preferably ofsome wrought metal. They are entirely independent of each other, can beat tached together in any way desired, or separated and packed fortransportation, while the destruction or breakage of either does notaffeet the other piece, so that the whole crab is not destroyed, as isthe case with those now in use, whether cast or wrought, when one partof it only is injured.

I am aware that neck-yokes have been constructed of several pieces ofmaterial, arranged so that the yoke is indirectly secured to the pole,or a swivel thereon hence I lay no claim to such a device; but

What I do claim as my invention, and desire to secure by Letters Patent,is

A pole-crab consisting of a pole-tip and yoke composed of differentmaterials, the yoke being secured directly upon the tip, substanftiallyas shown and described.

In testimony that I claim the foregoing improvement in pole-crabs forvehicles, as above described, I have hereunto set my hand this 31st dayof May, 1877.

ROBERT S. GRUMMON.

Witnesses WM. D. CARTER, E. G. BURNET.

